Add sample snippet

snippets/sample.md

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+---
+title: sample
+tags: list,random,beginner
+---
+
+Returns a random element from an array.
+
+Use `randint()` to generate a random number that corresponds to an index in the list, return the element at that index.
+
+```py
+from random import randint
+
+def sample(lst):
+  return lst[randint(0, len(lst) - 1)]
+```
+
+```py
+sample([3, 7, 9, 11]) # 9
+```